Add a method to allow using TL types for media in InputMessage

[er-azh]

Adds two new methods to InputMessage , photo_id and document_id. These new methods allow the user to include media in their messages using InputPhoto and InputDocument without having to copy the media from a message or re-uploading.

[er-azh]

Hmmm, what about adding something like this and then adding into_document and into_photo to Uploaded instead?

pub fn media<T: Into<tl::enums::InputMedia>>(mut self, media: T) -> Self {
    self.media = Some(media.into());
    self
}

The issue with using a generic parameter for the current document and photo methods is that I can't think of a way to differentiate between the media types (eg. InputMediaPhoto and InputMediaDocument) while accepting both uploaded and forwarded variants of InputMedia (eg. InputMediaPhoto and InputMediaUploadedPhoto) without adding at least one unnecessary wrapper type.

[Lonami]

I was thinking of two traits, IntoInputPhoto and IntoInputDocument, both implemented for Uploaded, but only one for the raw types.

[er-azh]

I've updated everything based on the telegram discussion.